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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b5d82b8ae24ccc7d8dbde3f30c566af76d55c00d25a9c656fa81a73c9ec374' 
  AND token = 'XkMJVfst4lKbbB8V9iNGYXpGOPn0W7P2pwLygPjpIL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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