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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72f96d1e29a513920c6aa6bd5395bd3b9702181f0aa4a2c368a05484b0b0c2f' 
  AND token = '0n8F6nZiKbnAp06wziGMbgcZ1FUkSWZunqzAXLyj7cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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