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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45b32af6b2c0e3affc7f6878b7b9eb449e74799c16ccbe6378ff0c6096c83fde' 
  AND token = '/xjVL2TQABQdOJjqAhAyqb15bdsSVvokpnSeq6dqmas=' 
  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"
    }
  }
}