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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3aaef86820097e301716a9a3ef9240235d0f666cdffa55f0ae8f996b7d7fda' 
  AND token = 'TZ5SPjbEbfvwvszQQIR0FzeZDBlQe7No6YnDDNwaARM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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