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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be06e49a97ec1eef21a1a2466609fab44932490d37b3ea2432d0d420fbdf0bb6' 
  AND token = 'ZoK6ztJwWSlt9h9lIzugaIKy+Pn63l1kPUHscdIfqJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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