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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8851090e437a6b8586a246a5a1c23195a43db5123f45ec8acccdf8593de0c5' 
  AND token = 'coBCzBGj78F/FT+2LGiEqicaxtr+STL+/Uxq0ovUCz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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