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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0247a23380e6e34663dca6b9102bea2081b5fe8d936bfe30dcc64a65cbd25b43' 
  AND token = 'DsHfsSp7RXgiz5bBjFxO/7A3/uAxRlRcqLgVQA7aIAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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