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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cdac78b6a974b1b08453ee308137a33a4a0fdd3155efc79300db1b619d55f83' 
  AND token = 'Q3GpiWHMGlJTiajeTl0syOXc17hd518+CcDqJ7oeQVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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