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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92a2004e251aac3b3fee4632e537b01cff37f6ddd2c3fc85fd923f80d9bc4be' 
  AND token = 'LMKZ/m58t3VjRQC6Fy12D1V8o/QJt8WjUZbIt6By16c=' 
  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"
    }
  }
}