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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e07b10974145dd106909b3eae652db0124cd93aa3d97855e33495f44db58d73' 
  AND token = 't95W/T3yOvuxtkkJjQ3wi1v1byojVaXZZuoCFxla3NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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