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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b9ed577ec2d29a5bcf9202dc01c2417432dadae1c9ef0897fc12a138a06bd7' 
  AND token = 'dqMNo4YfOfSHPKSlnU39xYqFFnuF3ZwRZI3h+sZ33Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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