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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5bddd22e6e3778080be8d8691d7e0ac8f3c49eea2b232d9e7afabb36cd06b4' 
  AND token = 'RZSPv0cQ0fWXlZMe8c1Q47NtoGiO6gWHBjJGN4huoMU=' 
  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"
    }
  }
}