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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba9a7e71e91abc3046e2a58d25ac9c7531469ee81719189af1e308dcca4cf6d7' 
  AND token = 'EytaBGfZ3S7jrsVrdmkAhcYcMDs2L39TnsLckpNFz2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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