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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e8365cb6e5ed727ce98a9fbeba802510c008a9a22843b5e11d9c48365b85bc' 
  AND token = 'fYn3vuJApOhV7i+sP9/vEGh24uzi4qm5RjfbS8jxnc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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