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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439ad1e784d8f4ec6138a17e6526cf8d1bb57176aa3663a6836c30b6d5f0eceb' 
  AND token = 'CmjbOrNagxaTQZF9KzZHJS4PppaawCRbVRlX3eli0fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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