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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de793e8e5e36956f042398b405bd3e6e17a9f423f1b2229e765cbb2b8a4d2009' 
  AND token = 'lzk7s2M1dGSYHtBV2xYBRoj38vDMzmR+sbN0IEkHS8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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