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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e375ebaf98ffbad6e916053cb59ab3358bf10ac67a0a94325ad7c019f3950e51' 
  AND token = 'L0c1rHIzQnOfB9ZhZK6ZQ/dEYv6Fh4Kpxj6+CbMhOa4=' 
  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"
    }
  }
}