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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c341de9318deab385eb7c6a246c9108e717e3ebc2c8c677960742d264a43f5' 
  AND token = 'qYkb9hz3MqnsJz94Eh0PkAW+6N0UlC4Z/GwI1jIsQqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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