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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eadd254cb4802e30d3ac8517148fb55ae87fc66a8d3b447c06ceedb7333d1bd' 
  AND token = 'je7y0QH2l6Hovl034dCnL7Kck5Apzg0cZX4UM+2ldHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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