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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4d4464a14a06828f27132ab2d882584ac6989900b3756cf506933ce667cbe5' 
  AND token = '8rJRRRcS7xDAu+kedotqxM8fDf0MFSGEkGeUrtcjxd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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