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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60cf5919d0b50d408da9a9b33d3fd72ceeb3e0e5daf184f3ee21ba3bc5f5072d' 
  AND token = 'M59bTLuXNK1jmKXeS/lN9lI3DT/KocfHc8BoU6aRv+Y=' 
  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"
    }
  }
}