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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f46f34802a1d4c6c7fec3fa22a9231dc11b0137f5563500ab82603758c6ecc51' 
  AND token = 'N4LY0A9jnziFTp6juoUzJ0QBXYAVEx4Dimh6TOs0UHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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