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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7a4aed8c82a30f65912f4a14a96d177985ae12537afce30eb055dd2fef1738' 
  AND token = 'Lj1bfwI2tm1lCm4bHn/dfFB5wr5FzfuZXO01oN6umIA=' 
  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"
    }
  }
}