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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52913fa92eef6994f64625c47ff1cb061f4b6fcd59e0ad829fd680e83401c4f5' 
  AND token = 'jkyObOAP19kgDGF1+YEpCpbx054NE6I9fYVKVb987/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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