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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fdb08142a5dafa95894bd2301fc556ef3351a5861a65e026df305aad6fdff2c' 
  AND token = 'oyxWp5qmOJVJGjSeVZew/YGtJ4c/o0dQlyamB1RSzTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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