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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eaa5e655e4e69fa3484b455308d079b9decba9b287ddf0996a8d5bd2fe6da4b' 
  AND token = '6cx4DJt6Oeo8ohAKtuBfBpEiydrWW3reEpdA3gZqfeg=' 
  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"
    }
  }
}