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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c2a6d9c28a4345e6f68fb5c1b5d4b8a538c5f927c325eaf3e8ba601cfcb5a2c' 
  AND token = 'kYciiKOmPBDyr09w7h7e572LULm3zaL5VsUp9mo+kYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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