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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba46f16ef6569d31ee3fa5d49dfb1acf5b443667fdf8424232baccfcd4190817' 
  AND token = 'JfxL95Oix4ew+KpYosaeszp/j65Ffi4IOOdl5jnYvfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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