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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51838bb637a22cba0e2ef036118ae3149323f2f06ae8b7c1480153ea58e771e2' 
  AND token = '9zSTtpeajVrhjW5VqA8Z6mKRrs7rCxoz0y3TYfvl6IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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