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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d1c73722f0998132f3f8a8eb62ac599f08f853859a64198a1a8ee1b39dbb72' 
  AND token = 'Jpqm0Z0IZJdYfOq0SOR4Ei8rIIAAJf2D8AjMXIBn6gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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