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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0832fbe976c2a491529210b07480db548e5e61672f04ea12d1758cb1f413afc' 
  AND token = '4M9BvnFv98rdaG26IdHgb8gJbEMV4wmd6bt7tIJ+tPg=' 
  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"
    }
  }
}