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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4d031cafb449f4928c1abcd556bfdd16d017a5ebc8b6e913e20aaef4c75263' 
  AND token = 'TItmmmC9EWHpaRCIuXphSuKwD5B+HMFrMIU5kqbFdTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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