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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0873e0652505e8cdb105406f656b0ec2de5fdb7d8388ce308d18435ac64f9906' 
  AND token = 'XvhGANkrzk8enMylv1kMNIEJOG5FOK4UlZOKOWw923o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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