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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a7d0a702d14d27cc7bffb4921e2879714736768afefe3bd297692660e73ce2' 
  AND token = 'YW3fkQ2WT0/zwOQQOClz0+ulikQBfTNqdZ/7BAF1YMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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