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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057c8dc7c55a86033e517a675871457fcba1c9e692e8e1fcb3f8b88eec120d56' 
  AND token = 'Pga2JaIjXIkJqLqKW9TmjYb2eBr8Vio/vBNtcnmLWFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}