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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae4c80ec3c5e7cd6bd0834b347de2557d985502151ab15879213f8c956376b5' 
  AND token = '9cyN7u77gc1xUq8eR+NgWCtGgGbvsFd1Uqt2yjo4ZgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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