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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f83cfca2bc8ca8c1ac16b8426e1d3179b58f5cbb65f9f5c220eefba766f36e' 
  AND token = '871CjJcGZKFR2Ex22TqXvnn5IY65ODy6Xl1gJI5DDDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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