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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c5181ea856eba569eec0191089fb07ac46b55880312599ca3ce68f69604484' 
  AND token = 'gGmdAg7r3AwUVLh53liHwKxekL5SX4SjgvgDEz4H7S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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