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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6961e61f060e0eb07819ddfc3b56a9ee3fb3f847501c4e40f004051ab1ef47b6' 
  AND token = 'F22PNG/FzFS6OIwYBKrH8ENHeqwg+1R1KuUuLQecQc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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