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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffad6cc02cc8497b15fb4bf614db0210f4abb515117d8ff8d15929ebe0f59df0' 
  AND token = 'q8l0FUQUEvkjtOVP8KLpAe/TSYOLWLQxRr+DYULI2sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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