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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ec3cd5232d0ac20ce560372a1e3c07186fd37891b785a7dc1a8d18a47858d0' 
  AND token = 'Eya89oGrB4BPspp9+8waL923HcaIaPbHqc1DlsJFupw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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