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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef35952d10e63ce4d6bd474b1019f300c3d174e63cdb399765a47a3a634240c1' 
  AND token = 'tOSsKmGcXaebJe0K3TZBH1D2+V8OYmtowuUYm2U4h78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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