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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91347d39f3b63e77c14fcda3b5adc19d4613d7318d9f60eeedf6047248ad971c' 
  AND token = '2uSkIB1eVIQI8Bk/2FRh50kMY66GIb1HQ3BdBfPi4VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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