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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5813c2ba3a737fa18112762b194d10fb4a601d3a206e8dc8e035d60b0caeb9' 
  AND token = '0iX8EWoRGEADCIYaI7f8YQbmO8drPfLyJwwTSN/fHnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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