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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973722b9e5b670bf85eb04eb7104a028fe91cdc35d39c9d65b7179a1dc44943e' 
  AND token = 'zcg914IlZD48haD9hGLJVW8/ZfhyJLhz1TaDfni8FEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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