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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c357cd42c788a5322a2378bd445e943b249d8aea6c4c9565679461b9ac64093' 
  AND token = 'iFBZI4kH2Ac9UjVrmrzpxewRCHapsIn8dQNvCq7xsjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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