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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21f0c0bd704856dfa2a5f1ed71ca5236dc0101e2a473a9e05fdc733fb6d2913c' 
  AND token = 'ol9PtQB+Pu7iOlcSqHjaSuMQX4hKrZazQqULNYUpkAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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