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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9fe6dfc44621e39a1a690a071f4a0bfe1ea88ee8f34c5310a8ce4ef92d7eee4' 
  AND token = 'i9xRKjjkGQAkL0OTOMjOCiPjusTIOTIeaCmc8dU6A0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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