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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf8a4f7f631a900e6123ebbd36633bed9fe48b7865cfb536936784bc3f9860b' 
  AND token = '3scZsDeSjUoGRrfAS9zyPDizsxlw++KB4jPee/r1u9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00124

JSON explain

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