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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795f66a11862fdcb8c434532f1e81f722aa5ea68bfc6562f88094f22b3597cc2' 
  AND token = 'ttlHkLLd89n8+F3GU2wj1qCdpWSi1Cj6ruV4ojZNSEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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