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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c51d76849c5e94d893db507cff61131a555f0434616491360276708a2c41c78' 
  AND token = 'y8pcbU0iLvDnFpyD79UCk7clXa6HKirMB+qeM2lbosM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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