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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99aa9e723ce0e6fb49cf3adedf8d70c3735d86c6f1ed9c0fe2ff82d42dff85de' 
  AND token = '/2Og1nPdFaMhs3xiRA6kotdthsQ9EkjnwrKA9SkHA20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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