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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80b9f8858ab8a60ae2359328ae2ac4f42286af90fe0b4c5075d62688e9ae9f3b' 
  AND token = '2htuP86pRnUBXM7zuV/dFJdv64WF4TfPuT9JDc7Gruw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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