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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10bfe8e835c3cb32c94923bde7381769eb77c730dfacf0dcb0bf5bc4ece2668' 
  AND token = '6OIf1i5sJL4N7z+Dvrml5FFnjCSWjbHA57m6rSlr/uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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