Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b78937f953e7fb5e35ecf7becbad7f965f13a2a4d14a423afba880deb0959405' 
  AND token = 'qCLo7uy0ltNZPGTj1OxExZtqbCoHJMv1LMf4qrjISNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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