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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6381ebc7c2352b4e45fb126fec9d715f8fd90b479f4bcf283920f8c3f002895e' 
  AND token = '5xaEvKxwlqoiZIeKu6EhnL9srrg8moh14+U2q/oeQ0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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