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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37aecd53e9a744091c46656847d9995c59416e4c251d075fb1bc5efebd7de81f' 
  AND token = 'NvCWCvMZjaA+t505XHu7qzVrhWQgxj5Qa/01UdVF+uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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