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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8ec7ca760cbe2369fdf21502b48f3e07d416b16109355d5faa0c704feef8e8' 
  AND token = 'OPFU//Fns2XnW593AMwBo0PtTemEcvh33zaQR+z8ojI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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