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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013109d06b598d261c8537b62cccced16c6c624d2123cac8e3ff3d02e09f1d81' 
  AND token = 'ByEHZTNQk1CPX7IDO+3x2v/fH/51Zre0sbJp428WbFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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